ossfd-general — OSSFD General Mailing List

[Ossfd-general] FASD project: Online survey launched

[<ben...@id...>]

Dear Open Source developer

I am doing a research project on "Fun and Software Development" in which I kindly invite you to participate.
You will find the online survey under http://fasd.ethz.ch/qsf/. The questionnaire consists of 53 questions and you will need about 15 minutes to complete it.

With the FASD project (Fun and Software Development) we want to define the motivational significance of fun when software developers decide to engage in Open Source projects. What is special about our research project is that a similar survey is planned with software developers in commercial firms. This procedure allows the immediate comparison between the involved individuals and the conditions of production of these two development models. Thus we hope to obtain substantial new insights to the phenomenon of Open Source Development.


With many thanks for your participation,
Benno Luthiger


PS:
The results of the survey will be published under http://www.isu.unizh.ch/fuehrung/blprojects/FASD/.
We have set up the mailing list fa...@we... for this study. Please see http://fasd.ethz.ch/qsf/mailinglist_en.html for registration to this mailing list.

_______________________________________________________________________

Benno Luthiger
Swiss Federal Institute of Technology Zurich
8092 Zurich

Mail: benno.luthiger(at)id.ethz.ch
_______________________________________________________________________

[Ossfd-general] GNU Scientific Library

[Haisam I. <ha...@id...>]

I believe we should begin building the project using this library and perhaps
being part of the GSL project:

http://sourceforge.net/forum/forum.php?forum_id=294595 and
http://sources.redhat.com/gsl/ with lots of info on wrappers, also docs here:
http://sources.redhat.com/gsl/ref/gsl-ref_toc.html

One of the more important functions needed in orbital mechanis is the ability to
numerically integrate non-linear differential equations and GSL has the
functions to do this.  Here\'s sample code from the docs which can easily be
modified to numerically integrate the equations of motion of satellites:

Your feedback to the list would be appreciated.

---

#include <stdio.h>
#include <gsl/gsl_errno.h>
#include <gsl/gsl_matrix.h>
#include <gsl/gsl_odeiv.h>

int
func (double t, const double y[], double f[],
      void *params)
{
  double mu = *(double *)params;
  f[0] = y[1];
  f[1] = -y[0] - mu*y[1]*(y[0]*y[0] - 1);
  return GSL_SUCCESS;
}

int
jac (double t, const double y[], double *dfdy, 
     double dfdt[], void *params)
{
  double mu = *(double *)params;
  gsl_matrix_view dfdy_mat 
    = gsl_matrix_view_array (dfdy, 2, 2);
  gsl_matrix * m = &dfdy_mat.matrix; 
  gsl_matrix_set (m, 0, 0, 0.0);
  gsl_matrix_set (m, 0, 1, 1.0);
  gsl_matrix_set (m, 1, 0, -2.0*mu*y[0]*y[1] - 1.0);
  gsl_matrix_set (m, 1, 1, -mu*(y[0]*y[0] - 1.0));
  dfdt[0] = 0.0;
  dfdt[1] = 0.0;
  return GSL_SUCCESS;
}

int
main (void)
{
  const gsl_odeiv_step_type * T 
    = gsl_odeiv_step_rk8pd;

  gsl_odeiv_step * s 
    = gsl_odeiv_step_alloc (T, 2);
  gsl_odeiv_control * c 
    = gsl_odeiv_control_y_new (1e-6, 0.0);
  gsl_odeiv_evolve * e 
    = gsl_odeiv_evolve_alloc (2);

  double mu = 10;
  gsl_odeiv_system sys = {func, jac, 2, &mu};

  double t = 0.0, t1 = 100.0;
  double h = 1e-6;
  double y[2] = { 1.0, 0.0 };

  while (t < t1)
    {
      int status = gsl_odeiv_evolve_apply (e, c, s,
                                           &sys, 
                                           &t, t1,
                                           &h, y);

      if (status != GSL_SUCCESS)
          break;

      printf(\"%.5e %.5e %.5e\\n\", t, y[0], y[1]);
    }

  gsl_odeiv_evolve_free(e);
  gsl_odeiv_control_free(c);
  gsl_odeiv_step_free(s);
  return 0;
}

[Ossfd-general] Re: ephemerides

[Haisam I. <ha...@id...>]

Quoting Myles Standish <em...@sm...>:

> Haisam K. Ido 
>  
> May 12m 2003 
> 
> 
> You have asked, \"Anyone in JPL interested in joining this Open Source 
> project?\".  I would strongly doubt it.  We are busy with our own
> projects.  Perhaps you would be interested in the following website:
> 
>   http://ssd.jpl.nasa.gov/
> 
> And, incidentally, when I looked at your website,
> http://sourceforge.net/projects/ossfd, I found it empty.

True.  It is only in its planning stages.  Thank you for the link.  I\'ll add the
link above.

> 
> Myles Standish 
>  
> ********************************************************* 
> * Dr E Myles Standish; JPL 301-150; Pasadena, CA  91109 * 
> * TEL: 818-354-3959                   FAX: 818-393-6388 * 
> * Internet:  em...@jp...           [128.149.23.23] * 
> ********************************************************* 
> 
>  
> 

[Ossfd-general] Re: ephemerides

[Haisam I. <ha...@id...>]

Thank you Mr. Standish.  Anyone in JPL interested in joining this Open Source
project?

Quoting Myles Standish <em...@sm...>:

> Haisam K. Ido
> 
> May 12m 2003
> 
> Thank you for asking about the JPL ephemerides.
> 
> You may use the JPL Planetary and Lunar Ephemerides, and you may put
> them on the server,  http://sourceforge.net/projects/ossfd.
> 
> However, you must not change their name, and you must not change their 
> format.  I.e., they must be referred to as, e.g., \"JPL Planetary and
> Lunar Ephemerides DE405\" the first time they are mentioned and then
> simply \"DE405\" thereafter.  Also, they must remain in the original
> form of chebychev polynomials.
> 
> 
>  
> Myles Standish  
>   
> *********************************************************  
> * Dr E Myles Standish; JPL 301-150; Pasadena, CA  91109 *  
> * TEL: 818-354-3959                   FAX: 818-393-6388 *  
> * Internet:  em...@jp...           [128.149.23.23] *  
> *********************************************************  
> 

Re: [Ossfd-general] My background ....

[Haisam K. I. <ha...@id...>]

Paul:

Did you get my posting below?  It doesn't appear on the archive page!

Haisam Ido wrote:
> I\'m an employee of Intelsat (http://www.intelsat.com); however, this project,
> OSSFD is not affiliated with Intelsat at all and I am not representing Intelsat
> when I make public statements.  I currently manage the Orbital Control Section,
> which is in charge of station keeping Intelsat\'s 25 geosynchronous satellites in
> their assigned boxes.
> 
> I have a BS in Aeronautical-Astronautical Engineering, and a BS in Applied
> Mathematics.  I also hold an MS in Aerospace Engineering.
> 
> I am an avid follower and an advanced user of Linux, perl, php, mysql, apache
> web server.  I have over 20 years experience with Fortran.  I am a beginner in C
> and C++.  However, the syntax is understandable.
> 
> I\'ve added some links to the news section of the project;
> 
> http://sourceforge.net/news/?group_id=64889
> 
> Regards,
> Haisam Ido
> 
> 
> -------------------------------------------------------
> Enterprise Linux Forum Conference & Expo, June 4-6, 2003, Santa Clara
> The only event dedicated to issues related to Linux enterprise solutions
> www.enterpriselinuxforum.com
> 
> _______________________________________________
> Ossfd-general mailing list
> Oss...@li...
> https://lists.sourceforge.net/lists/listinfo/ossfd-general

[Ossfd-general] My background ....

[Haisam I. <ha...@id...>]

I\'m an employee of Intelsat (http://www.intelsat.com); however, this project,
OSSFD is not affiliated with Intelsat at all and I am not representing Intelsat
when I make public statements.  I currently manage the Orbital Control Section,
which is in charge of station keeping Intelsat\'s 25 geosynchronous satellites in
their assigned boxes.

I have a BS in Aeronautical-Astronautical Engineering, and a BS in Applied
Mathematics.  I also hold an MS in Aerospace Engineering.

I am an avid follower and an advanced user of Linux, perl, php, mysql, apache
web server.  I have over 20 years experience with Fortran.  I am a beginner in C
and C++.  However, the syntax is understandable.

I\'ve added some links to the news section of the project;

http://sourceforge.net/news/?group_id=64889

Regards,
Haisam Ido

[Ossfd-general] OSSFD

[<PB...@ao...>]

In a message dated 5/1/2003 7:20:38 PM Eastern Standard Time, ha...@id... writes:

> On the list let's discuss our backgrounds. 

CTO TransOrbital, Inc. <http://www.transorbital.net>, constructing a commercial lunar spacecraft. 
20 years systems integration and electronics design, including both hardware and software design. Lots of engineering type software written in C, C++, FORTRAN, and National Instruments LabView. My main background is in machine vision systems and interface design, I make no claims to being a guru in control systems. But I can talk the language and code just about anything. 

Paul Blase